Document holder

ABSTRACT

A document holder for use in a workstation is provides, wherein the document holder comprises a generally planar easel member having front and back opposite surfaces, a top edge, a bottom edge, first and second side edges extending from the top edge to the bottom edge on opposite sides of the easel member, a first side rail adjacent to the first side edge and extending along at least a portion of the first side edge, and a second side rail adjacent to the second side edge and extending along at least a portion of the second side edge. The document holder further includes a first support base, a second support base, and first and second adjustable bracket assemblies extending from the first and second support bases, wherein each of the first and second adjustable bracket assemblies is pivotally and slideably attached to the first and second side rails of the easel member, respectively.

TECHNICAL FIELD

[0001] The present invention relates to document holders. More particularly, the present invention provides an adjustable document holder for supporting documents or other items in various positions for viewing by the user.

BACKGROUND OF THE INVENTION

[0002] Ergonomic issues for computer users have been known for many years, including the potential health problems associated with computer use. Some of these potential problems, such as eye strain, neck strain, and fatigue, can be related to the improper positioning of documents or other items that are being referenced while using the computer. These problems can often be lessened or eliminated by properly positioning the documents for the user. Because the proper document positioning can vary between users, the solutions to improving the ergonomics of document positioning can likewise vary.

[0003] One way that documents can be properly positioned for a user involves using a document holder on either side of the computer monitor. Document holders of this type can be attached to the side of the computer monitor or may be free-standing items that sit near the computer monitor on the work surface or desk. Because conservation of limited desktop space is often important to the user, these document holders are typically only as wide as a single sheet of paper. Even when they are only this wide, however, some users may find it inconvenient to find an appropriate place on their desktop to place the document holder.

[0004] Another type of device useful for positioning documents may be situated directly in front of the user and in between the keyboard and the computer monitor. This type of device is referred to as an “inline” document holder since the user, keyboard, document holder, and computer monitor are essentially all in line with each other. Because the area between the keyboard and monitor is not generally useful for any other purpose, these inline document holders can typically be at least as wide as the keyboard and monitor without sacrificing valuable space on the desktop. Thus, inline document holders are typically wider than the free-standing document holders described above and can be made wide enough to accommodate accounting ledgers, open books or magazines, or two stacks of papers adjacent to each other on the holder.

[0005] While using an inline document holder in a single position is possible for some users, many applications require periodic adjustment of the document holder. For example, a user may improve the ergonomic arrangement of his or her workspace by adding devices such as keyboard trays, keyboard drawers, or monitor risers. These additional devices will sometimes necessitate adjustment of an inline document holder. Further, workstations are sometimes shared by different users during a day, and each user may have different preferences regarding the positioning of the document holder, thereby making an adjustable document holder desirable. Finally, document holders are also preferably adjustable simply to accommodate users that wish to adjust their positioning relative to their computer throughout the day, and to accommodate materials of different weights and sizes. While adjustable inline document holders are known, many of these devices are awkward to adjust and may require separate adjustment mechanisms for each type of directional adjustment. For these and other reasons, it is desirable that an inline document holder be easily adjustable for its users.

SUMMARY OF THE INVENTION

[0006] In one aspect of this invention a document holder for use in a workstation is provides, wherein the document holder comprises a generally planar easel member having front and back opposite surfaces, a top edge, a bottom edge, first and second side edges extending from the top edge to the bottom edge on opposite sides of the easel member, a first side rail adjacent to the first side edge and extending along at least a portion of the first side edge, and a second side rail adjacent to the second side edge and extending along at least a portion of the second side edge. The document holder further includes a first support base, a second support base, and first and second adjustable bracket assemblies extending from the first and second support bases, wherein each of the first and second adjustable bracket assemblies is pivotally and slideably attached to the first and second side rails of the easel member, respectively. The first and second adjustable bracket assemblies may further comprise a knob including a threaded member, a support arm comprising a hole that extends at least partially through the arm and wherein the hole includes a threaded portion adapted for receiving the threaded member of the knob, and a clamp assembly comprising a body and a hole through the body adapted for receiving the threaded member of the knob. The clamp assembly may further comprise a flange and a channel adapted for receiving one of the first and second side rails.

[0007] The document holder may further include a line guide removably attached to the first and second side rails, wherein the line guide may include an elastic member having a first end and a second end, a first tab attached to the first end, and a second tab attached to the second end.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further explained with reference to the appended Figures, wherein like structure is referred to by like numerals throughout the several views, and wherein:

[0009]FIG. 1 is a perspective view of a computer workstation including one embodiment of a document holder of the present invention;

[0010]FIG. 2 is a perspective view of one embodiment of the document holder of the present invention;

[0011]FIG. 3 is a perspective view of a portion of the document holder of FIG. 2, including an adjustable bracket assembly;

[0012]FIG. 4 is a cross-sectional view of another embodiment of an adjustable bracket assembly of the present invention;

[0013]FIG. 5 is a perspective view of another embodiment of a document holder of the present invention; and

[0014]FIG. 6 is a perspective view of another embodiment of a document holder of the present invention, including a document holder mounting system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Referring now to the drawings, and initially to FIGS. 1 and 2, one preferred embodiment of document holder 10 is shown. Document holder 10 is designed to be primarily used in a computer workstation that includes a computer monitor 12 that is supported on a desk or work surface 14. The surface 14 may be any suitable generally horizontal surface that can support the weight of a computer monitor 12, such as a table, desk, or the like. The workstation may further include one or several risers 13 on which the monitor 12 is supported. The number and height of risers 13 may be selected by the user to achieve a particular vertical position of the monitor and can also provide other advantages such as drawers for storage space for papers and other small items. This vertical position of the monitor may be changed simply by adding or removing risers 13, as desired, or by using risers having different heights. The use of risers 13 in this way can further increase the versatility of the workstation and allow for optimal positioning of the document holder 10 relative to the monitor 12. Typically, computer monitor 12 is positioned near a front edge 16 of work surface 14, which is the edge that would be closest to the user who is viewing the monitor 12.

[0016] The workstation further includes a keyboard 18, which can be rigidly mounted within the workstation or may be positioned relative to the surface 14 with any of a number of various keyboard positioning devices. For one example, the surface 14 may be a desk that includes a keyboard tray or drawer that can be slid or rolled horizontally by the user to move the keyboard 18 to a desired position. Alternatively, the keyboard 18 may be mounted or resting on an adjustable keyboard tray of the type that is attached to the surface opposite the work surface 14 on which the monitor 12 is placed. An example of such an adjustable keyboard tray is a keyboard tray of the type commercially available as model number AKT200 from the Minnesota Mining and Manufacturing Company of St. Paul, Minn. Keyboard trays of this type provide more flexibility for keyboard positioning since they can be adjusted vertically, horizontally, and rotationally. Regardless of the type of keyboard support used, document holder 10, monitor 12, and keyboard 18 are preferably generally in a single line with each other when viewed from the front of the computer workstation.

[0017] As shown in FIG. 2, document holder 10 generally includes an easel member 20 and first and second support bases 22, 24 pivotally and slideably attached to easel member 20 by way of first and second adjustable bracket assemblies 26, 28, respectively. Easel member 20 includes a relatively planar base plate 29 that is preferably made of a transparent plastic material such as clear polycarbonate, clear acrylic, or glass, but may instead be semi-transparent or opaque and may have indicia, designs or other graphics printed thereon for viewing by the user or to coordinate the color of the document holder with the workspace. Base plate 29 further includes a front face 30 and a back face 32, where front face 30 is the surface on which documents can rest when the document holder 10 is in use. Base plate 29 also includes a top edge 34, a bottom edge 36 which is preferably generally parallel with the work surface 14, and a flange portion 38 that extends along at least a portion of the width of the bottom edge 36. Flange portion 38 is designed to support the bottom edge of materials placed on the document holder 10 so that the materials can be held on the document holder 10 when the easel member 20 is vertical or tilted away from the user. In order to best hold documents on its surface, flange portion 38 is typically perpendicular to base plate 29, but may extend at any angle that would prevent materials from slipping off of the easel member 20. Additionally, the flange member 38 should be wide enough to accommodate the materials placed on the easel member 20 and would typically be as wide as base plate 29 to provide the maximum area possible for documents and the like. Finally, because the depth of flange member 38 determines thickness of the materials that may be supported on the easel member 20, member 38 should be at least deep as the typical thickness of the materials that are to be placed on the easel member 20.

[0018] Base plate 29 includes first and second side edges 40, 42 extending in a generally vertical direction from top edge 34 to bottom edge 36 on opposite sides of base plate 29. While side edges 40, 42 are preferably parallel to each other, they may instead be angled relative to each other or the edges 40, 42 may be curved or otherwise shaped in the same or opposite directions from each other. In accordance with the present invention, base plate 29 further includes first and second side rails 44, 46 adjacent to and extending in generally the same direction as the side edges 40, 42.

[0019] Preferably, rails 44, 46 are generally parallel to side edges 40, 42, particularly when side edges 40, 42 are parallel to each other, however, the rails could be angled or offset relative to each other. As shown in FIG. 2, side rails 44, 46 extend from back face 32 of base plate 29. Rails 44, 46 may be attached to the base plate 29 by attachment methods such as adhesives, welding, mechanical fasteners, or the like, or may be integrally molded into the base plate 29. Thus, rails 44, 46 may be made of the same or a different material than base plate 29. Rails 44, 46 may extend along the entire distance from the top edge 34 to the bottom edge 36, or may extend for only a portion of that distance. Longer rails 44, 46 will allow for a larger range of vertical adjustability of the easel member 20, as further described below.

[0020]FIG. 2 shows one preferred configuration of rails 44, 46, where each rail is generally L-shaped when viewed from the top of document holder 10. From this view, the first leg of the L-shaped rail extends generally perpendicularly from back surface 32 of base plate 29 and the second leg of the L-shaped rail extends generally perpendicularly from the first leg of the rail, thereby being spaced from and generally parallel to back surface 32 of base plate 29. However, it is understood that many other shapes of the rails 44, 46 are also within the scope of the present invention, as long as they can be secured to the adjustable bracket assemblies 26, 28 and allow for the necessary easel member adjustments described below.

[0021] Document holder 10 is supported on a work surface by support bases 22, 24 when in use. As shown in FIG. 1 for a typical computer workstation, one base 22 is positioned on work surface 14 on one side of the monitor 12 and the other base 24 is positioned on work surface 14 on the other side of the monitor 12 so that easel member 20 is generally in line with the monitor 12. Support bases 22, 24 are preferably sufficiently heavy to support the weight of the easel member 20 and any documents supported thereon without allowing the document holder 10 to tip over when in use. This weight may be provided by using an outer shell for each base that is filled with a relatively dense and heavy substance such as sand or steel shot. Alternatively, each base may be made of a solid, relatively heavy material, such as rubber or steel. Support bases 22, 24 may further be provided with a substance or material on their bottom surfaces (not shown) to protect the desk or work surface 14 on which the document holder 10 is placed and to prevent slippage of the document holder 10 relative to the work surface 14. Examples of materials that may be used for this purpose include neoprene, rubber, or the like.

[0022] It is further understood that document holder 10 may instead comprise a single support base that extends across a portion of the width of the easel member 20. If a single base is used, the adjustable bracket assemblies of the present invention would extend from the single base and attach to the easel member in essentially the same manner as described below.

[0023] Again referring to the Figures, and particularly to FIGS. 2 and 3, first support base 22 is detachably connected to the first side rail 44 by first adjustable bracket assembly 26. Likewise, second support base 24 is connected to the second side rail 46 by second adjustable bracket assembly 28. Each of the components described with regard to the adjustable bracket assemblies, side rails, and support bases is preferably a mirror image of the corresponding component on the opposite side of the document holder (e.g., first adjustable bracket assembly 26 is preferably a mirror image of second adjustable bracket assembly 28). Thus, for clarity of the following description, the connection of first support base 22 to easel member 20 by the first adjustable bracket assembly 26 will be described, with the understanding that the description also applies to the second support base 24 and second adjustable bracket assembly 28.

[0024] Adjustable bracket assembly 26 includes a support portion or arm 50 rigidly attached to and extending from support base 22. A bore or hole 52 extends at least partially through arm 50, where at least a portion of hole 52 is threaded. Assembly 26 further includes a detachable clamp assembly 54 which includes a body 56, a flange portion 58 and a hole or bore 60 through the body 56. Clamp assembly 54 also includes a knob 62 having a screw 64 extending therefrom. The threads in hole 52 are adapted to receive the threads of screw 64 and hole 60 is adapted to allow the screw 64 to pass through it.

[0025] When document holder 10 is assembled, screw 64 of knob 62 extends through hole 60 and into the threaded hole 52 of arm 50. Side rail 46 is positioned between arm 50 and flange portion 58 so that arm 50 contacts one side of side rail 46 and flange portion 58 contacts the other side of side rail 46. When knob 62 is tightened, side rail 46 is thus frictionally held by the clamping force or pressure between the arm 50 and flange portion 58, thereby keeping the rail 46 in the desired position relative to the support base 22.

[0026] Flange portion 54 may further include a channel 59, which is designed to match a side rail 46 profile (such as the L-shaped profile described above) so that a portion of side rail 46 fits in the channel 59 when the document holder 10 is assembled. In this way, channel 59 can “capture” the side rail 46, which helps to keep rail 46 positioned within the adjustable bracket assembly 26. It is understood that the clamping force or pressure generated by tightening knob 62 may create pressure between side rail 46 and the inside of channel 59.

[0027] In order to detachably connect support base 22 to easel member 20 via the adjustable bracket assembly 26, knob 62 is positioned so that screw 64 extends through hole 60. Clamp assembly 54 is brought toward arm 50 until the screw 64 is positioned adjacent the hole 52. Screw 64 may then be partially inserted into the hole 52 by rotating the knob 62. Side rail 46 may then be positioned between arm 50 and flange portion 58 and the knob turned until the contact between the side rail 46, arm 50, and clamp assembly 54 is sufficiently tight that the rail 46 cannot slide relative to the arm 50 and flange portion 58. When it is desired to adjust the orientation of the easel member 20, however, the user simply rotates the knob 62 in the opposite direction, thereby loosening the connection between the side rail 46, arm 50, and clamp assembly 54. When the assembly is loosened in this way, the user may then rotate the easel member 20 about an axis 66 relative to the work surface 14 (shown as directional arrow 68), thereby changing the angle of the base plate 29 relative to work surface 14.

[0028] Advantageously, when the connection is loosened as described above, the user may also move the easel member 20 vertically relative to the computer monitor 12 and keyboard 18 in a direction shown as directional arrow 70. In other words, the easel member 20 can be raised or lowered by sliding the side rail 46 within the adjustable bracket assembly 26. When the easel member 20 is adjusted to the position desired by the user, knob 62 may then again be rotated to tighten the connection between the side rail 46, arm 50, and flange portion 58 and essentially “lock” the easel member 20 in place. It is preferable that the user loosen and tighten both adjustable bracket assemblies 26, 28 generally simultaneously so that both sides of the easel member 20 may be moved at the same time, thereby keeping easel member 20 generally square relative to the work surface 14.

[0029] Adjustable bracket assembly 26 may further include a washer (not shown) between arm 50 and body 56 of clamp assembly 54. The washer would preferably be compressible and made of a material such as neoprene or another elastomeric material. This washer is useful to provide a more secure connection between the various parts of the bracket assembly because it provides a cushion against which the clamp assembly 54 can continue to be tightened, even after the rigid parts are in contact with each other.

[0030] While the above description contemplates a document holder 10 having sufficient weight in the support bases 22, 24 to keep document holder 10 from tipping, it is also contemplated that the bottom surface of support bases 22 include an adhesive for attaching the bases 22, 24 to a work surface 14. Preferably, this adhesive would be removable so that the work surface would not be damaged upon removal of the adhesive. One example of such an adhesive is the adhesive known under the trade designation “Command” and commercially available from the Minnesota Mining and Manufacturing Company of St Paul, Minn. Another alternative method of keeping the document holder 10 in place relative to a work surface 14 would be with the use of hook and loop fasteners, where loop fabric on one surface attaches to hooks on a mating surface. Many other methods of attaching the bases 22, 24 to a work surface 14 may also be used, such as using intermeshing structures, magnetic attraction, and other known methods of attaching two surfaces to each other.

[0031]FIG. 4 illustrates in cross-section another construction of an adjustable bracket assembly 26′, which is also used to detachably and adjustably connect support base 22′ to an easel member. In this embodiment, adjustable bracket assembly 26′ comprises an arm 50′ having an unthreaded hole or bore 52′ that passes through its thickness and clamp assembly 54′ which includes a body 56′, a flange portion 58′, and a hole or bore 60′ through body 56′. Clamp assembly 54′ also includes an unthreaded rod 65′ having a flange 66′ on one end and a cam 67′ with an attached lever 68′ on the opposite end. In order to tighten the clamp assembly 54′ to a rail 40′, lever 68′ would be moved in the direction (shown as directional arrow 69′) that causes the cam 67′ to draw or pull the arm 50′ toward body 56′ of clamp assembly 54′. Preferably, the cam 67′ is designed so that lever 68′ would be generally flush with the side of the clamp assembly 54′ when in its tightened position.

[0032] Another embodiment of a document holder 110 of the present invention is illustrated in FIG. 5. The basic components of the document holder 110 include an easel member 120 and first and second support bases 122, 124 pivotally and slideably attached to easel member 120 by way of first and second adjustable bracket assemblies, 126, 128, respectively. In this embodiment, support bases 122, 124 comprise a pair of longitudinal rails 180 with a channel 182 between the rails. Each bracket assembly 126, 128 has a support portion or arm 150, 150′, where the bottom of each arm 150, 150′ includes a T-shaped flange 184 which is adapted to fit within one of the channels 182. When the document holder 110 is assembled, each of the extensions 184 is positioned within one of the channels 182. The easel portion 120 may then be moved toward and away from the monitor in a direction shown as directional arrow 186 by simply moving the bracket assemblies 126, 128 so that extensions 184 slide within channels 182 of their respective support bases 122, 124.

[0033] Document holder 110 further includes a means of adjusting easel member 120 both vertically and pivotally that is similar to that described above with respect to FIGS. 1-3, however, first and second adjustable bracket assemblies 126, 128 are designed to work slightly differently. In this embodiment, adjustable bracket assembly 126 comprises an arm 150 rigidly attached to and extending from support base 122. An unthreaded bore or hole extends through arm 150. Assembly 126 further includes a clamp assembly 154 which comprises a body 156, a flange portion 158, and an unthreaded bore or hole through the body 156. Adjustable bracket assembly 128 further comprises an arm 150′ attached to and extending from support base 124. An unthreaded bore or hole extends through this arm 150′. Assembly 128 further includes a clamp assembly 154′ which comprises a body 156′, a flange portion, and a bore or hole that passes at least partially through body 156′ and is threaded along at least a portion of its length. Document holder 110 further includes a rod (not shown) that is threaded at one end and has a knob 162 at its opposite end. This rod passes through the hole in arm 150, the hole through body 156, the hole through arm 150′. The threaded portion of this rod can then be threaded into the threaded portion of the hole passing through body 156′. Document holder 110 further includes a tube 190 that surrounds the rod and is the same length as the desired spacing between support bases 122, 124.

[0034] To adjust the position of the easel member 120 in this embodiment, the knob 162 is turned in the direction that loosens the threaded portion of the rod relative to the threaded portion of body 156′, which loosens both clamp assemblies 154, 154′ and allows movement of the rails within these clamp assemblies. The desired vertical and rotational adjustments to the easel member may then be made and the knob 162′ can then be turned to tighten the connections in the bracket assemblies.

[0035]FIG. 6 illustrates another embodiment of the present invention similar to that of FIG. 5. In this embodiment, the document holder 110 is additionally provided with a clamping assembly 192 that is useful for securing the document holder 110 to a work surface (not shown). Clamping assembly 192 includes a generally C-shaped bracket 194 that extends from each of the support bases 122, 124 and is designed to have a profile that closely matches that of a desk or work surface on which the document holder 110 will be used. A knob 196 includes a threaded portion (not shown) that extends through bracket 194 in a position that allows it to be under the work surface when the document holder is secured to a work surface. To use this clamping assembly 192, the document holder 110 is placed on a work surface so that support bases 122, 124 are resting on the top of the work surface and so that bracket 194 is adjacent to the work surface. In other words, the C-shape of bracket 194 is adjacent to the front surface 16 of work surface 14 of the type shown in FIG. 1. Simply positioning the unit in this way may be sufficient, but the document holder 110 may be more tightly secured to the work surface by turning knob 196 to increase the pressure between the knob surface and the bottom of the work surface.

[0036] Many other methods of attaching or mounting document holder 10 to a work surface are contemplated by the present invention. For example, many known clamping mechanisms can be used to clamp the document holder 10 to a work surface, where the embodiment of FIG. 6 illustrates just one example. Also, document holder 10 may be more permanently mounted to the work surface 14, such as by drilling holes into the bottom or top side of a work surface and securing the document holder to the work surface by screwing the document holder to these holes in the work surface.

[0037] An additional feature of the present invention is shown in FIGS. 1 and 2 as line guide 72. Line guide 72 comprises a pair of attachment tabs 74 and an elastic portion 76 connecting the tabs 74. Elastic portion 76 may be any elastomeric material, such as rubber, for example. Each tab 74 includes a channel 78 that is adapted to fit onto the side edges 40, 42 of easel member 20. It is preferable that the channel 78 is slightly larger than the thickness of each of the side edges 40, 42 so that each tab 74 can slide freely along the side edges when the user is adjusting the line guide 72. Elastic portion 76 should be a length that requires the user to slightly pull the elastic material in tension to provide the force that keeps the tabs 74 on the side edges 40, 42. This also provides the necessary tension on the tabs 74 to keep the line guide from sliding down the side edges 40, 42. However, it is also preferable that the elastic portion 76 not be so short that it is difficult to pull across the width of easel member 20.

[0038] To use the line guide 72, a user may place their documents or materials on the easel member 20 so the bottom edge of the materials is resting on flange member 38 and the back of the materials is resting on the front face 30 of base plate 29. One of the tabs 74 can then be slipped over one of the side edges 40, 42, and the other of the tabs 74 can be slipped over the other of the side edges 40, 42 so that the elastic portion 76 is positioned on top of the materials. This line guide 72 can be useful to hold materials in place on the easel member, to hold bound materials (such as books and magazines) in their open position, and for a user to keep track of a particular location in the materials. The line guide 72 can be easily moved up and down the side edges 40, 42 as desired. Materials may be removed from or added to the document holder 10 by simply pulling back the elastic member 76 a sufficient amount to give the necessary clearance to access the items. Thus, it is not necessary to remove line guide 72 each time a user wishes to remove items from or add items to the easel member 20.

[0039] While the various document holders in accordance with the present invention have been described as being used in a typical workstation having a computer monitor, desk or work surface, and a keyboard, it is understood that the document holders of the present invention may also be used for different document holder applications. For example, the document holder may be used to simply hold documents in a particular position on a work surface where no monitor or keyboard is used, such as using the document holder as a podium for presentation materials or for displaying items such as a cookbook or a daily planner on a work surface.

[0040] The present invention has now been described with reference to several embodiments thereof. The entire disclosure of any patent or patent application identified herein is hereby incorporated by reference. The foregoing detailed description and examples have been given for clarity of understanding only. No unnecessary limitations are to be understood therefrom. It will be apparent to those skilled in the art that many changes can be made in the embodiments described without departing from the scope of the invention. Thus, the scope of the present invention should not be limited to the structures described herein, but only by the structures described by the language of the claims and the equivalents of those structures. 

1. A document holder for use in a workstation, the document holder comprising: a generally planar easel member having front and back opposite surfaces, a top edge, a bottom edge, first and second side edges extending from the top edge to the bottom edge on opposite sides of the easel member, a first side rail adjacent to the first side edge and extending along at least a portion of the first side edge, and a second side rail adjacent to the second side edge and extending along at least a portion of the second side edge; a first support base; a second support base; and first and second adjustable bracket assemblies extending from the first and second support bases, wherein each of the first and second adjustable bracket assemblies is pivotally and slideably attached to the first and second side rails of the easel member, respectively.
 2. The document holder of claim 1, wherein each of the first and second adjustable bracket assemblies further comprises: a knob including a threaded member; a support arm comprising a hole that extends at least partially through the arm and wherein the hole includes a threaded portion adapted for receiving the threaded member of the knob; and a clamp assembly comprising a body and a hole through the body adapted for receiving the threaded member of the knob.
 3. The document holder of claim 2, wherein the clamp assembly further comprises a flange and a channel adapted for receiving one of the first and second side rails.
 4. The document holder of claim 1, wherein a first side of the first side rail is in contact with a portion of the support arm and wherein a second side of the first side rail is in contact with a portion of the body of the clamp assembly.
 5. The document holder of claim 1, wherein each of the first and second support bases further includes a pair of rails and a channel between the rails for receiving a portion of one of the first and second adjustable bracket assemblies.
 6. The document holder of claim 1, wherein each of the first and second support bases further includes a clamping means for clamping each of the support bases to a surface.
 7. The document holder of claim 1, wherein the first adjustable bracket assembly comprises a clamp assembly having a body and an at least partially threaded hole that extends at least partially through the body.
 8. The document holder of claim 1, further comprising a line guide removably attached to the first and second side rails.
 9. The document holder of claim 8, wherein the line guide comprises an elastic member having a first end and a second end, a first tab attached to the first end, and a second tab attached to the second end.
 10. The document holder of claim 9, wherein each of the first and second tabs comprises a channel portion adapted to receive one of the first and second rails.
 11. The document holder of claim 1, wherein the first side rail is parallel to the second side rail.
 12. The document holder of claim 1, wherein each of the first and second side rails has an L-shaped cross section. 